Daniel, thanks a lot your help, I'm getting more closer to the origin
of the issue. (I hope.)
I CC'ed the dev@ list as well, so I'm summarize the problem again.

I'm cross compiling subversion for an ARM9 based development board (mini2440).
(You'll find my configure options below.)
This is a totaly clean environbent. There are just the libraries of
toolchain (codesourcery).
I built apr, apr-util, zlib, and sqlite from subversion-deps package,
and the subversion itself.
It is version 1.6.15.

I figured out, that the first execution of fs_fs__read_noderev is
parsing the /var/svn/testrepo/db/revs/0/0 file.
What is the input of the second execution? I see thet it is in wrong
format, but what is the origin of this?